Old English from a millennia ago sounds like a foreign language, even early modern English from Shakespeare’s time sounds pretty odd. So it depends on when the translation was done. With English it’s common for newly invented words to get popularized and end up in the dictionary. The same kind of thing happens with grammar. Conversely people still sometimes use obsolete words from early modern English as a way to emphasize a statement.
The grammar of that quote may be due to the English translation of the time or something he simply interpreted in his own way. It sounds grammatically off for contemporary English, but that’s relative to the time frame. I imagine the English we speak today may sound odd to someone a few hundred years from now.